Sadly, there's no way around the math: there is a lot of it in physical chemistry. If you are struggling with the math and it's too late to take a remedial course in calculus, you may want to just buy a calculus or diff-eq intro textbook and review on your own time.
Not sure what textbook you are using for p chem but if you can pick up a (used) copy of McQuarrie and Simon, there are lots of primer modules in it on the various mathematics that you will be using throughout the course.